Smart Meter Data Integrity Verification Mechanism

The DL/T645-2007 communication protocol employs a frame check mechanism in 3 phase smart meter data interaction. By performing vertical check code calculations on the address field, control code, and data field, it achieves data accuracy verification at the transmission layer. The protocol stipulates that each frame contains seven components, including the start of frame character, slave address field, and data field length. Each byte generates a checksum through a specific algorithm, which the receiving end can use to determine the integrity of the data packet. When three phase smart meter uploads metering parameters such as power, voltage, and current to the main station, the system compares the checksum of the received data with the calculated value. If they do not match, a retransmission mechanism is initiated.

In the 3 phase wifi energy meter data storage stage, encrypted storage technology can be used to prevent local data from being illegally tampered with. The AES encryption algorithm has been widely used for data protection in single phase wifi energy meter. By encrypting the metering records in the memory chip and generating a message verification code (MAC) using a hash function, the system can recalculate the MAC value when reading historical data and compare it with the original value to identify whether the data has been modified. This dual verification method establishes end-to-end data integrity assurance for the 555 from acquisition to storage.